package top.jinruida.nio.zerocopy;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.nio.ByteBuffer;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;

/**
 * NIO 零拷贝案例
 * 案例要求：
 *
 * 使用传统的 IO 方法传递一个大文件
 * 使用 NIO 零拷贝方式传递（transferTo）一个大文件
 * 看看两种传递方式耗时时间分别是多少
 */
public class NewIOServer {
    public static void main(String[] args) throws IOException {
        InetSocketAddress address = new InetSocketAddress(7001);
        ServerSocketChannel serverSocketChannel = ServerSocketChannel.open();
        ServerSocket serverSocket = serverSocketChannel.socket();
        serverSocket.bind(address);

        //创建buffer
        ByteBuffer byteBuffer = ByteBuffer.allocate(4096);

        while (true){
            SocketChannel socketChannel = serverSocketChannel.accept();
            int readcount = 0;
            while (-1 != readcount){
                try {
                    readcount = socketChannel.read(byteBuffer);
                }catch (Exception ex){
                    // ex.printStackTrace();
                    break;
                }
                byteBuffer.rewind(); //倒带 position = 0 mark 作废
            }
        }
    }
}
